This is Richard from PageFly - Shopify Page Builder App, I’d like to suggest this idea:
You can use tools to measure your page speed such as PageSpeed Insights, GTmetrix.. and to be able to improve your page speed, you need to optimize your store with custom code, you should find an expert. code to do this.
Hope you find my answer helpful! Best regards, Richard | PageFly
Please let me know if it works by giving it a Like or marking it as a solution!